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https://issues.apache.org/jira/browse/FLINK-38954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhangxing updated FLINK-38954:
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Description:
For historical compatibility reasons, I compiled Flink 1.18.1 using JDK 8. Now,
I intend to upgrade the JDK version (to either 11 or 17) and want to test if
the performance improves after the upgrade—this will help me determine whether
the upgrade is meaningful. I chose to use the Flink Benchmark project for
testing; however, after conducting the tests, I found that many metrics
actually *decreased* following the JDK upgrade. I also checked the metrics in
Flink Speed Center and noticed the same issue (as shown in the figure below).
!image-2026-01-21-15-56-21-514.png|width=632,height=261!
Is this situation normal? Or is my testing approach correct?
was:
For historical compatibility reasons, I compiled Flink 1.18.1 using JDK 8. Now,
I intend to upgrade the JDK version (to either 11 or 17) and want to test if
the performance improves after the upgrade—this will help me determine whether
the upgrade is meaningful. I chose to use the Flink Benchmark project for
testing; however, after conducting the tests, I found that many metrics
actually *decreased* following the JDK upgrade. I also checked the metrics in
Flink Speed Center and noticed the same issue (as shown in the figure below).
!image-2026-01-21-15-56-21-514.png!
Is this situation normal? Or is my testing approach correct?
> Flink Benchmark Score Decreases After Upgrading JDK Versions of Flink Engine
> and User Program
> ---------------------------------------------------------------------------------------------
>
> Key: FLINK-38954
> URL: https://issues.apache.org/jira/browse/FLINK-38954
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Web Frontend
> Affects Versions: 1.18.1
> Reporter: zhangxing
> Priority: Major
> Attachments: image-2026-01-21-15-56-21-514.png
>
>
> For historical compatibility reasons, I compiled Flink 1.18.1 using JDK 8.
> Now, I intend to upgrade the JDK version (to either 11 or 17) and want to
> test if the performance improves after the upgrade—this will help me
> determine whether the upgrade is meaningful. I chose to use the Flink
> Benchmark project for testing; however, after conducting the tests, I found
> that many metrics actually *decreased* following the JDK upgrade. I also
> checked the metrics in Flink Speed Center and noticed the same issue (as
> shown in the figure below).
> !image-2026-01-21-15-56-21-514.png|width=632,height=261!
> Is this situation normal? Or is my testing approach correct?
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